Here are some examples:
* "Hazle caso a tu madre": Listen to your mother.
* "No le hagas caso a los rumores": Don't pay attention to the rumors.
* "Siempre le hace caso a su novio": She always listens to her boyfriend.
It's important to note that "hacerle caso a" can also be used with things, not just people:
* "Hazle caso al manual de instrucciones": Pay attention to the instruction manual.
* "No le hagas caso a esa máquina, está averiada": Don't pay attention to that machine, it's broken.
In general, "hacerle caso a" implies taking something seriously and acting upon it, whether it's a person's advice, a warning, or even a piece of equipment.